from django.db import models
from django.utils import timezone 
from django.contrib.auth.models import User 
from taggit.managers import TaggableManager
# Create your models here.
# 导入reverse函数
from django.urls import reverse
# 如下为新增代码
from django.db.models.query import QuerySet
class PublishedManager(models.Manager):
    def get_queryset(self) -> QuerySet:
      return super(PublishedManager,self).get_queryset().filter(status='published')

class Post(models.Model): 
  objects = models.Manager()
  published = PublishedManager()
  # 增加tags字段 
  tags = TaggableManager()

  STATUS_CHOICES = ( 
    ('draft', 'Draft'),
       ('published', 'Published') 
  ) 
  title = models.CharField(max_length=250) 
  body = models.TextField() 
  slug = models.SlugField(max_length=250, unique_for_date='publish') 
  author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='author') 
  publish = models.DateTimeField(default=timezone.now) 
  created = models.DateTimeField(auto_now_add=True) 
  updated = models.DateTimeField(auto_now=True) 
  status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='draft') 
 
  class Meta:
    ordering = ('-publish',) 
  def __str__(self):
    return self.title 
  def get_absolute_url(self):
    return reverse('blog:post_detail', args=[self.publish.year,self.publish.month, self.publish.day, self.slug])

class Comment(models.Model):
  post = models.ForeignKey(Post,on_delete=models.CASCADE,related_name='comments')
  name = models.CharField(max_length=80)
  email = models.EmailField()
  body = models.TextField()
  created = models.DateTimeField(auto_now_add=True)
  updated = models.DateTimeField(auto_now=True)
  active = models.BooleanField(default=True)
  class Meta:
    ordering = ('created',)
  def __str__(self):
    return f'Comment by {self.name} on {self.post}'
